CMAS Science Grade 8 Practice Questions - Colorado Measures Of Academic Success (CMAS) Science - Grade 8 Exam

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Students measure the mass of a sealed bag of baking soda and vinegar before and after the reaction. No gas escapes. What should they observe about total mass?

Total mass stays the same because mass is conserved in a closed system Total mass must double because a gas formed Total mass becomes zero because the reactants disappear Total mass always decreases when temperature rises

Correct Answer:

Total mass stays the same because mass is conserved in a closed system

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